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1) A resistant strain with a gauge factor of 2 is fastened to a steel member,which is subjected to a strain 1x10^-6 .If the original resistance value of the gauge is 130Ω ,calculate the change in resistance.
Answer
Answer
2.6 x 10^-4 Ω
2) Capacitive transducers can be used by _______________
a) Measuring change in distance between plates
b) Measuring change in area of plates
c) Change in a dielectric material
d) All of the mentioned
Answer
Answer
Answer: d
Explanation: Capacitance of a material is affected by area and distance of separation of plates and dielectric material.
3) what is material that use in piezeoelectric tranducers
Barium Titanate
Lead Zirconate Titanate (PZT)
Sodium chloride
Natrium salt
a) 1 and 4
b) 1 and 2
c) 3 and 4
d) 2 and 4
answer
answer
b) Barium Titanate and Lead Zirconate Titanate
4) A round steel bar, 0.02 m in diameter and 0.40 m in length, is subjected to a tensile force of 33.000 kg, where E=2x1010 kg/m2. Calculate the elongation, L, in meters.
ANSWER
ANSWER
=2.1 × 10^-3 m
5) A thermistor has a resistance of 3.5k2 and a dissipation constant PD = 5mW/°C and a slope of -0.1/°C at 20°C. The thermistor is to be used in the voltage divider shown. Find
(i) the power dissipated in the thermistor,
(ii) the temperature rise of the thermistor, and
(iii) the actual thermistor resistance where resistance change/resistance = slope x temperature change.
ANSWER
ANSWER
) power dissipated = 7.143mW
ii) change in temperature, △T = 1.43°c
iii) actual resistance = 3kΩ
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